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The National Telephone Numbering Plan

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The National Telephone Numbering Plan The National Telephone Numbering Plan Publication date: 4 January 2021 Contents Section Overview 2 Definitions and interpretation 3 Introduction 9 Part A: Telephone Numbers Available for Adoption 10 Part B: Restrictions and requirements in relation to Telephone Numbers in Part A 15 Part C: Telephone Numbers not available for Allocation 21 Annex Appendix A: Geographic Numbering - Geographic Area Codes and applicable geographic area 26 Appendix B: Telex Service Numbers – initial Geographic Area Codes and applicable designation 35 Annex (not part of the National Telephone Numbering Plan): General Condition B1 of the General Conditions of Entitlement 37 1 The National Telephone Numbering Plan Overview Ofcom administers the UK’s telephone numbers. We do this as part of our regulation of the communications sector under the framework established by the Communications Act 2003 (‘the Act’). It is our duty, as required by section 56 of the Act, to publish the National Telephone Numbering Plan, setting out the telephone numbers available for allocation and any restrictions on how they may be adopted or used. 2 The National Telephone Numbering Plan Definitions and interpretation 1. For the purpose of interpreting these conditions the following definitions shall apply: ‘100-Number Block Area’ means a geographic area in which 100-number blocks have been made available for Allocation, as indicated in Appendix A of this Plan; ‘1471 Erasure’ means a facility that enables the record of the last call received (where accessible through dialling 1471) to be removed so as to no longer be available on dialling 1471; ‘Access Charge’ shall have the meaning ascribed to that term in the Definitions set out in the Schedule to the Notification issued by Ofcom on 19 September 2017 setting general conditions under section 45 and 48(1) of the Act (as that Schedule may be modified from time to time); ‘Access Code’ means a short Non-Geographic Number, usually beginning with ‘1’, that allows End- Users to access a wide range of services; ‘Act’ means the Communications Act 2003; ‘Administrative Code’ means a Telephone Number that is Adopted or otherwise used for administrative purposes only; ‘Automatic Call Trace’ means a facility that can, where practicable, trace the origin of an incoming call; ‘BT’ means British Telecommunications plc, whose registered company number is 1800000, and any of its subsidiaries or holding companies, or any subsidiary of such holding companies, all as defined in section 1159 of the Companies Act 2006; ‘C7’ refers to a standard for common channel signalling in Electronic Communications Networks (also known as ‘SS7’); ‘Called Party’ means the person being contacted by means of a telephone call; ‘Calling Line Identification’ means a facility that enables identification of the number from which a call is being made or to which a return call could be made; ‘Calling Parties’ means persons making contact by means of a telephone call; ‘Call Return’ means a facility, based on the accessibility of Calling Line Identification, which enables identification of the number from which a call is being made or to which a return call could be made; ‘Carrier Pre-Selection’ means a facility which allows a Subscriber to whom a Publicly Available Telephone Service is provided by means of a Public Communications Network to select which Pre- selected Provider of such Services provided wholly or partly by means of that Network is the Pre- Selected Provider he wishes to use to carry his calls by designating in advance the selection that is to apply on every occasion when there has been no selection of Provider by use of a Telephone Number; ‘Carrier Pre-Selection Code’ means a non-diallable four (4) digit Network Code commencing with the digit eight (8) (i.e. 8XXX), that is Adopted or otherwise used in connection with the provision of Carrier Pre-Selection; ‘Communications Provider’ means a person who (within the meaning of section 32(4) of the Act) provides an Electronic Communications Network or an Electronic Communications Service; 3 The National Telephone Numbering Plan ‘Communications Provider Identification Code’ means an Administrative Code Allocated to Communications Providers that is Adopted or otherwise used to identify other Communications Providers; ‘Conservation Area’ means a geographic area indicated as such in Appendix A of this Plan; ‘Consumer’ means any natural person who uses or requests a Public Electronic Communications Service for purposes which are outside his or her trade, business or profession; 'Corporate Number' means a Non-Geographic Number Allocated to a Communications Provider where the number is to be assigned by that Communications Provider to a specific Customer and in this definition 'Customer' shall only refer to a customer which is a body corporate. The cost of a call to a Corporate Number is paid for through the telephone bill of the Subscriber; ‘Default Reseller Identification Code’ means the Reseller Identification Code (‘RID’) ‘AAA’ which can be used on any network where no individual Reseller Identification Code is selected; ‘Dominant Provider’ has the same meaning as in any SMP Condition in force concerning Carrier Pre- Selection that is imposed on a person by Ofcom under section 90 of the Act; ‘Free to caller’ means, in relation to a Non-Geographic Number, one that can be accessed by a Consumer at a retail price of zero and, in the case of a Public Pay Telephone, without having to use coins and cards; ‘General Conditions of Entitlement' means those conditions set by Ofcom on 19 September 2017 under section 45 of the Act by way of a Notification published pursuant to section 48(1) of the Act, and modified by Ofcom from time to time; ‘Geographic Area Code’ means a Public Communications Network Number identified with a particular geographic area; ‘Geographic Number’ means a Public Communications Network Number: (i) that is Adopted or otherwise used for routing calls to the physical location of the Network Termination Point of the Subscriber to whom the Telephone Number has been assigned; and (ii) the initial digits of which comprise a Geographic Area Code from Appendix A of this Plan; ‘Geographic Number Portability Code’ means a Network Code used for the Portability of Geographic Numbers; ‘Harmonised number for harmonised services of social value (116XXX numbers)’ means a Type B Access Code used to provide a service meeting a common description on the same 116XXX number throughout European Union Member States and the United Kingdom; ‘Inbound Routing Code’ means a Network Code Adopted or otherwise used for routing purposes and which may be used to identify Electronic Communication Services, carriers and End-Users; ‘Indirect Access’ means a facility which allows a Subscriber to whom a Publicly Available Telephone Service is provided by means of a Public Communications Network to select which such Service provided wholly or partly by means of that Network is the service he wishes to use by the use of a Telephone Number on each separate occasion on which a selection is made; ‘Indirect Access Provider’ means a provider of Indirect Access services; ‘International Mobile Station Identity’ means a string of decimal digits up to a maximum length of 15 digits which identifies a unique subscription to a Mobile Service in accordance with International Telecommunication Union (ITU)-T Recommendation E.212; 4 The National Telephone Numbering Plan ‘Integrated Services Digital Network’ means a Network based on the existing digital Public Communications Network which provides digital links to Customers and end to end digital connectivity between them; ‘Internal Network Portability Code’ means a Network Code which is used to ensure that Portability is effective within a Network; ‘Internal Routing Code’ means a Network Code which is used for routing purposes within an Electronic Communications Network; ‘International Signalling Point Code’ means a Signalling Point Code that constitutes an independent address for international purposes, in accordance with ITU-T Recommendation Q.708; ‘Local Dialling’ means the ability for a Calling Party to contact a Called Party within the same Geographic Area Code area by dialling only the Local Number; ‘Local Number’ means a Geographic Number excluding the Geographic Area Code; ‘Location Independent Electronic Communications Service’ means a service that includes the assignment of a Non-Geographic Number to a Customer but where: (i) the location of the Customer’s Apparatus identified by that number at the time of use is not necessarily permanently associated with a particular Network Termination Point; (ii) number translation from that number to a Geographic Number is not provided as part of the service; and (iii) the service is not a Mobile Service; ‘Mobile Network Code’ means a Network Code that is part of the International Mobile Station Identity and identifies the home network of a unique subscription to a Mobile Service; ‘Mobile Number’ means a Non-Geographic Number that is Adopted or otherwise used as part of a Mobile Service to identify Apparatus designed or adapted to be capable of being used while in motion; ‘Mobile Number Portability Code’ means a Network Code used for the Portability of Mobile Numbers; ‘Mobile Service’ means a service consisting in the conveyance of Signals, by means of an Electronic Communications Network, where every Signal that is conveyed thereby has been, or is to be, conveyed through the agency of Wireless Telegraphy to or from Apparatus designed or adapted to be
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